I have been wanting to improve my ACS coverage out in the Sound and think I have done it for about $100. I purchased an omnidirectional antenna that I purchased at Frigid North Electronics here in Anchor town. Here is a link to the antenna: http://www.wilsonelectronics.com////...uctB.php?ID=30
It was my understanding that the antenna will only work if you get some signal. We were anchored in a cove closer to Valdez than Whittier, surrounded by mountains and I had absolutely no signal. I mounted the antenna on the roof and fished the cable down through my radar pedestal and plugged the phone in. I had signal! In fact, I had signal everywhere we traveled except for a small area just outside the Port Wells side of Ester Passage. I may try a booster in the future, but I think I will put that $300 in one of my three fuel tanks. I forgot to take pictures of the install, but will if there is any interest.
Note: I did this not so that I can hear my phone ring, but so I can call back to civilization and gloat on the fact that I am gorging myself on huge Alaskan spots, flat fish, and enjoying a cold beverage served over 10,000 year old glacial ice!